<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<title></title>
	<style type="text/css">
		div{
			width: 200px;
			height: 200px;
			background: aqua;
			float: left;
			margin: 20px;
		}
		div:nth-of-type(1){
			border-radius: 30px;
		}
		div:nth-of-type(2){
			/*	左上 右下 0 右上 坐下50%		*/
			border-radius: 0 50%;
		}
		div:nth-of-type(3){
			/*	顺时针：左上 右上 右下 左下		*/
			border-radius: 0px 20px 50px 50%;
		}
		div:nth-of-type(4){
			border-radius: 50%;	
		}
		div:nth-of-type(5){
			/*	椭圆 宽高不一致		*/
			border-radius: 50%;
		}
	</style>
</head>
<body>
	<div>1</div>
	<div>2</div>
	<div>3</div>
	<div>4</div>
	<div>5</div>
	<div>6</div>
	<div>7</div>
	<div>8</div>

</body>
</html>